// Array
let arr = [1, 2, 5];
// Object
let user = {
  name: "Jason",
  age: 24,
};

//Date
let now = new Date();

// Function
function fun() {
  return 10;
}
console.log("Array:", arr.toString());
console.log("Object:", user.toString());
console.log("Date:", now.toString());
console.log("Function:", fun.toString());

// hint 是  default， valueOf => toString
console.log(1 + now);
